Water-heater.



PATENTED FEB. 25, 1908.

F. P. OBENAUER.

WATER HEATER.

APPLICATION FILED MAY 24, 1907.

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FREDERICK P. OBENAUER, OF DETROIT, MICHIGAN.

WATE B-HE ATER Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed. May 24 1907- Serial No. 375.495-

To all whom it may concern:

Be it known that I, FREDERICK P. OBEN- Anna, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in ater-Heaters, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to water heaters; it has'for its object an improved form of water heater in which the water is forced by defleeting plates to travel repeatedly across and back through a chamber or receptacle adapted to be subjected to a heating flame or to the application of heat on the underside of it.

The object of the invention is to produce a cheap and eflicient article, in which the water to be heated is exposed throughout its entire course of travel and is compelled to travel in a narrow stream, preferably a stream passing through a coil of pipe in a structure that can be made much more easily, cheaply and is much more durable than. the ordinary coil of pipe.

In the drawings :-Figure 1, is a section at the line a, a, of Fig. 2. Fig. 2, is a longitudinal section of the heater.

The heater consists essentially of two cast metal case members, of which the larger and deeper member is provided with a grooved. surface 2 adapted to engage closely within the opening of the member 3; around the raised central portion of this surface is a groove for the engagement therein of a flange 4, that runs entirely around the edge of the member 3. The raised surface 5 is further provided with cross grooves 25 adapted to engage with ribs 6 in the member 3, these ribs rise from the bottom of the member and extend alternately'from either side thereof nearly to the opposite side so that each of the ribs 6 extending from theside 7 lies between two ribs 6 extending from the side 7 and each of the ribs 6 lie between two ribs 6, extending from the side 7. At

the ends the ribs 7" lie between a rib 6 and the end of the member and the ribs 6 be. tween a rib 6 and 8, of the member. Between the end .9 and the first rib 7 is an inlet opening for an inlet pipe 10, which passes through the walls of both case members and into the interior conduit between the rib 9 .end 8.

and the rib 7. At the diagonally located corner is an outlet 11, which extends through the walls of both case members and delivers from the space between the last rib 6 and the The flange 4 on the member 3, engages closely against the bottom 13 of the member 1, and the two parts are secured together by bolts 1.4. In use the deep walls which appear as hanging walls of the member 1, in Fig. 2, are used to confine heat to the underside of the assembled structure.

The heat is applied to the heater in any suitable way, preferably by gas jets or gas burner, over which the heater is placed and which are not shown in this drawing because they form no part of this invention. The water which enters the heater is compelled to traverse between the inlet pipe 10 and the outlet 11, a long devious course through the whole of which it is subjected or may be subjected to the heat over which the heater is suspended.

The structure does not furnish'as great a heating surface as a tube having a length equal to that through which the water must pass, but it is much more compact than a coil would be and much more readily constructed and the interior is easily accessible for cleaning purposes.

The engagement between the ribs and the grooved side 2, of the member 1, is comparatively water tight,.but not necessarily absolutely so, as any small amount of leakage will be practically immaterial, inasmuch as the most of the water is to travel along the devious course described, and the small amount of water which may leak across the intersections of the ribs and the grooves in which they rest, would not affect the utility of the article.

WVhat I claim is 1. In a water heater, the combination of two case members, one of said membersbeing'provided with hanging walls adapted to confine heated air to the under side of said heater, and a grooved surface inclosed within said walls and with a seating groove extending entirely around said grooved surface, the other of said members being provided with a flange adapted to seat in said seating groove and with plates adapted to engage in said grooved surface, and means for securing the two members together, substantially as described.

2. A heater, having in combination two provided With a grooved central portion and with flanges projecting from the edges and with a seating groove extending entirely around the central portion and With hanging Walls adapted to confine heated air tothe under side thereof, the other of said members being provided with a flange adapted to engage in said seating groove and With baffle plates adapted to extend into and seat into the grooves of said central portion, the said plates being shorter than the distance across said member and arranged to produce a travel of the Water many times across and back over thesaid grooved surface, substantially as described.

In testimony whereof, I, sign this specification in the presence of two Witnesses.

FREDERICK P. oBnNAUER.

Witnesses:

O. F. BURTON, MAY E. Ko'rr. 

